Pathogenesis of infection with LP VN/1203/K and LP VN/1203/E in chickens.

ANumber of samples positive for virus antigen as measured by immunohistochemistry. Scoring system: 1 = Antigen sparse, 2 = Antigen common, 3 = Antigen abundant. BVirus isolation was performed by inoculation of 3 embryonated chicken eggs per tissue sample. CIncludes dermis of feathered skin, feather pulp and comb; for other tissues see the result section. DOther tissues are liver, kidney tubules, spleen, lung interstitium, connective tissues, lymphoid follicles, and salivary glands. EThrombocytes. FNumber of birds with one or more positive tissues. *Significantly different from each other (P<0.05, two-tailed Fisher's exact test).